Added healthcheck

Dockerfile

@@ -6,8 +6,8 @@ LABEL maintainer="quentin.mcgaw@gmail.com" \
       ram="11.89MB" \
       cpu_usage="Low to medium" \
       github="https://github.com/qdm12/private-internet-access-docker"
-RUN apk add -q --progress --no-cache --update openvpn unbound && \
-    apk add -q --progress --no-cache --update --virtual=build-dependencies ca-certificates wget unzip && \
+RUN apk add -q --progress --no-cache --update openvpn unbound ca-certificates wget && \
+    apk add -q --progress --no-cache --update --virtual=build-dependencies unzip && \
     mkdir /openvpn-udp-normal /openvpn-udp-strong /openvpn-tcp-normal /openvpn-tcp-strong && \
     wget -q https://www.privateinternetaccess.com/openvpn/openvpn.zip \
             https://www.privateinternetaccess.com/openvpn/openvpn-strong.zip \
@@ -20,6 +20,7 @@ RUN apk add -q --progress --no-cache --update openvpn unbound && \
     apk del -q --progress --purge build-dependencies && \
     rm -rf /*.zip /etc/unbound/unbound.conf /var/cache/apk/*
 COPY unbound.conf /etc/unbound/unbound.conf
+HEALTHCHECK --interval=10m --timeout=3s --start-period=5s --retries=1 CMD [ $(wget -qO- -T 2 https://api.ipify.org) != "$INITIALIP" ] || exit 1
 ENV ENCRYPTION=strong \
     PROTOCOL=tcp \
     REGION=Switzerland

README.md

@@ -28,6 +28,7 @@ It is based on:
 - [Alpine 3.7](https://alpinelinux.org)
 - [OpenVPN 2.4.5-r1](https://pkgs.alpinelinux.org/package/edge/main/ppc64le/openvpn)
 - [Unbound 1.7.0-r2](https://pkgs.alpinelinux.org/package/edge/main/aarch64/unbound)
+- wget and ca-certificates for the healthcheck
 
 It requires:
 - A Private Internet Access **username** and **password** - [Sign up](https://www.privateinternetaccess.com/pages/buy-vpn/)
@@ -107,6 +108,11 @@ Cloudflare **DNS 1.1.1.1 over TLS** is used to connect to any PIA server for mul
 
 ## Testing
 
+1. Note that you can simply use the HEALTCHECK provided. The container will stop by itself 
+if the VPN IP is the same as your initial public IP address.
+
+Otherwise you can follow these instructions:
+
 1. Check your host IP address with:
 
     ```bash

entrypoint.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 
-printf "Changing DNS to localhost..."
+printf "\nDetecting current public IP address..."
+export INITIALIP=$(wget -qO- -T 2 https://api.ipify.org)
+printf "$INITIALIP\nChanging DNS to localhost..."
 echo "nameserver 127.0.0.1" > /etc/resolv.conf
 echo "options ndots:0" >> /etc/resolv.conf
 printf "DONE\nStarting Unbound to connect to Cloudflare DNS 1.1.1.1 at its TLS endpoint TCP 853..."